Hard Start

Check listed items as follows:

• Check fuel pressure. See FUEL PRESSURE TEST under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES article.
• Check engine coolant temperature sensor calibration. Perform appropriate diagnostic test. On Grand Cherokee, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - GRAND CHEROKEE article. On Liberty, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - LIBERTY article. On Wrangler, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - WRANGLER article.
• Check throttle position sensor calibration. Perform appropriate diagnostic test. On Grand Cherokee, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - GRAND CHEROKEE article. On Liberty, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - LIBERTY article. On Wrangler, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - WRANGLER article.
• Check manifold absolute pressure sensor. Perform appropriate diagnostic test. On Grand Cherokee, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - GRAND CHEROKEE article. On Liberty, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - LIBERTY article. On Wrangler, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - WRANGLER article.
• Check idle air control motor operation. Perform appropriate diagnostic test. On Grand Cherokee, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - GRAND CHEROKEE article. On Liberty, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - LIBERTY article. On Wrangler, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - WRANGLER article.
• Check EVAP emission system. On Grand Cherokee, see FUEL EVAPORATIVE SYSTEM under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - GRAND CHEROKEE article. On Liberty, see FUEL EVAPORATIVE SYSTEM under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - LIBERTY article. On Wrangler, see FUEL EVAPORATIVE SYSTEM under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - WRANGLER article.
• Check intake air temperature sensor. Perform appropriate diagnostic test. On Grand Cherokee, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - GRAND CHEROKEE article. On Liberty, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - LIBERTY article. On Wrangler, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - WRANGLER article.